Dear Nick,
After set value of gpio409, it can switch signal voltage of SD data as 1.8V.
Execus me. I just touch VIM3 board less than one monuth.
Could I ask more about gpio409?
Refer how-to-get-gpio-numbers… as the follow.
I still didn’t get the meaning of gpio409.
Which document or formal website can I study whose definition is gpio409?
Thank you!!
$cat /sys/kernel/debug/pinctrl/pinctrl-devices
name [pinmux] [pinconf]
pinctrl-meson yes yes
pinctrl-meson yes yes
pinctrl-audio-g12a yes no
$ cat /sys/kernel/debug/pinctrl/pinctrl@ff634480-pinctrl-meson/gpio-ranges
GPIO ranges handled:
0: periphs-banks GPIOS [410 - 494] PINS [0 - 84]
$ cat /sys/kernel/debug/pinctrl/pinctrl@ff800014-pinctrl-meson/gpio-ranges
GPIO ranges handled:
0: aobus-banks GPIOS [496 - 511] PINS [0 - 15]
$ cat /sys/kernel/debug/pinctrl/ff642000.audiobus\:pinctrl-pinctrl-audio-g12a/gpio-ranges
GPIO ranges handled: